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<p class="purpose">To provide routines to help build the various HTML index files, none of which are actually created in this section.</p>

<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>This module exists to serve either <a href="../inform7/index.html" class="internal">inform7</a> or <a href="../inter/index.html" class="internal">inter</a>, and it's not
up to us to decide where an index is put, so we ask nicely:
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">IndexLocations::path</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">IndexLocations::path</span></span>:<br/><a href="2-il.html#SP2">&#167;2</a>, <a href="2-il.html#SP3">&#167;3</a>, <a href="2-il.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">PATH_INDEX_CALLBACK</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">PATH_INDEX_CALLBACK</span><span class="plain-syntax">();</span>
<span class="plain-syntax">    #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">    #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">PATH_INDEX_CALLBACK</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>An oddity in the Index folder is an XML file recording where the headings
are in the source text: this is for the benefit of the user interface
application, if it wants it, but is not linked to or used by the HTML of
the index as seen by the user.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="function-syntax">IndexLocations::xml_headings_filename</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><a href="2-il.html#SP1" class="function-link"><span class="function-syntax">IndexLocations::path</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">I</span><span class="string-syntax">"Headings.xml"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>And the following function determines the filename for a page in this
mini-website. Filenames down in the <span class="extract"><span class="extract-syntax">Details</span></span> area have the form <span class="extract"><span class="extract-syntax">N_S</span></span> where
<span class="extract"><span class="extract-syntax">N</span></span> is an integer supplied and <span class="extract"><span class="extract-syntax">S</span></span> the leafname; for instance, <span class="extract"><span class="extract-syntax">21_A.html</span></span>
provides details page number 21 about actions, derived from the leafname <span class="extract"><span class="extract-syntax">A.html</span></span>.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="function-syntax">IndexLocations::filename</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">IndexLocations::filename</span></span>:<br/>Index Interpreter - <a href="2-ii.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">N</span><span class="plain-syntax"> &gt;= </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">full_leafname</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">full_leafname</span><span class="plain-syntax">, </span><span class="string-syntax">"%d_%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><a href="2-il.html#SP4" class="function-link"><span class="function-syntax">IndexLocations::details_path</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">full_leafname</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">full_leafname</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><a href="2-il.html#SP1" class="function-link"><span class="function-syntax">IndexLocations::path</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>Within the Index is a deeper level, into the weeds as it were, called
<span class="extract"><span class="extract-syntax">Details</span></span>.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="function-syntax">IndexLocations::details_path</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">IndexLocations::details_path</span></span>:<br/><a href="2-il.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Pathnames::down</span><span class="plain-syntax">(</span><a href="2-il.html#SP1" class="function-link"><span class="function-syntax">IndexLocations::path</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">I</span><span class="string-syntax">"Details"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Pathnames::create_in_file_system</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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